Pitman



(No Model.)

A. O. WIL$0N. PITMAN.

No. 566,365. gatented Aug. 25, 1896.

Illa:

ATENT Prion.

AMOS C. IVILSON, OF BUTLER, PENNSYLVANIA.

PITMANB SPECIFICATION forming part of Letters Eatent No. 566,365, datedAugust 25, 1896 Application filed October 29, 1895.

T0 ctZZ whom it may concern:

Be it known that I, AMOS 0. WILSON, a citi zen of the United States,residing in Butler, in the county of Butler, and in the State ofPennsylvania, have invented a new and original Improvement in PitmenUsed in Drilling and Operating Oil, Gas, and Water lVells; and I dohereby declare that the following is a full and exact descriptionthereof, reference be ing had to the accompanying drawings, and to theletters of reference marked thereon.

My invention relates to an improved pitman, and has for its object toprovide a simple construction whereby the parts can be readily attachedand detached by those not skilled in the art.

In the drawings, Figure 1 is a side elevation of my improvement. Fig. 2is an end View. Fig. 3 is a detail perspective View of a yoke used inthe construction of my device. Fig. 4: is a detail of the adjustablenut. Fig. 5 is a cross-section of the same. Fig. 6 is a detail of thelower bearing block. Fig. 7 is a detail.

The same numerals refer to like parts in all the figures.

The numeral 1 represents my improved pitman as a whole; 2, thepitman-rod, provided with screw-threads 3 at its upper end.

The pitman is passed through a slot 4 in the outer end of a walking-beam5, and is socured thereto by a crossbar 6, which is provided with ascrew-threaded perforation 7 with which the screw'thread 3 engages. Ashort distance from the bottom of the pitmanrod I securely bolt a yoke8, on the lower cross-arm of which is mounted a bearing block 9. Theblock is placed in the lower portion of the yoke and against the frontface of the crank-wheel 10, after which a plate 11 is bolted to thefront of the yoke by bolts 12. It will be thus seen that only one plateis necessary to retain the block in position, the front face of thecrank-wheel taking the place of a plate in the rear of the yoke. Shouldit be necessary to take out the block and insert a larger or smallerone, the front Serial No. 567,260. (1T0 model.)

plate is removed and the block and the other one inserted. The lower endof the pitmanrod is screwthreaded and is designed to engage ascrew-threaded opening in the upper end of a nut 13. This nut isprovided on its lower face with a hole 14, in which a bearingblock 15 isseated.

In practice the average length of the pitman is secured by adjusting thepitman-rod in the upper cross-bar, then the yoke is placed around thecrank-pin, and the final adjustment is made by turning the nut 13,causing the block 15 to bear down on the crank-pin.

Should the distance between the bottom of the nut and the top of thecrank-pin be too short, the bolts 17, which secure the yoke to thepitman-rod, are withdrawn and the rod moved up and the bolts inserted inany of a series of perforations 16 in the pitman-rod. By this means I amenabled to provide a third adjustment in attaching the pitman.

From what has been said it will be seen that I have provided a pitmanthat can be quickly and conveniently put up or taken down and one thatcan be adjusted.

Having thus described my invention, what I claim is- The combination ofa pitman-rod having screw-threads at both ends, a walking-beam, across-bar journaled on the end of the walking-beam and engaging thescrew-threads at the upper end of the pitmanrod, a nut adjustablymounted on the lower end of the pitman-rod and carrying a bearing-blockat its lower end adapted to engage the crankpin, a yoke adjustablymounted on the pitman-rod, a bearing-block in the lower end of the yoketo engage the crank-pin and resting against the face of the crank-wheel,and a retaining-plate secured to the outer side of the yoke and bearingagainst the outer face of said last-mentioned bearing-block.

AMOS 0. WILSON. Witnesses:

S. F. Bowsna, G. T. HEYDRICK.

